The Mountain from "Game of Thrones" just broke an almighty weightlifting record that once belonged to his archrival ... and now, he wants to break the dude's face in the ring.
Hafthor Bjornsson -- who played The Hound's brother on the hit HBO series -- set a new world record Saturday by deadlifting 501 kilograms (about 1,104 lbs) and staying standing upon releasing the massive weight, while he was getting gassed up by his squad nearby.
It's an incredible feat, and before this ... his muscle-man foe, Eddie Hall, held the record at 500 kg from just a few years ago when he deadlifted at the World Deadlift Championships.